Finding the Fourth Proportional to 2,147.76, 2,963.92 and 1,216.24

Step by Step Solution

1. Step 1: Write the proportion equation
   2,147.76 : 2,963.92 = 1,216.24 : x
2. Step 2: Convert to fraction form
   2,147.76/2,963.92 = 1,216.24/x
3. Step 3: Cross multiply
   2,147.76x = 2,963.92 × 1,216.24
4. Step 4: Simplify right side
   2,147.76x = 3,604,838.06
5. Step 5: Solve for x
   x = 3,604,838.06/2,147.76
6. Step 6: Final answer
   x = 1,678.42